Fix the hurricane-bfd PC file to use -lhurricane-bfd

I'd used the libflo pkg-config file as a template and forgot to
replace "-lflo" with "-lhurricane-bfd".
Have the hurricane-objdump help text print hurricane-objdump

Another problem that was just the result of a rename.
Merge branch 'master' of https://github.com/palmer-dabbelt/hurricane-binutils